Yeah but because Wikipedia articles, to an extent, ephemeral it is good practise to use the sources at the bottom of the article as your source, rather than the Wikipedia article itself. It makes finding the origin of the information easier.
If it is something more permanent like a paper or a published article, then that doesn't suffer from the same issues
Potentially privacy? Like only you can see your screen. But that's also a downside if you want to show someone something